> "The overall function of the MAS 3507D can be altered by downloading up to
> 1 kWord program code into the internal RAM and executing this code instead
> of the ROM code. During this time, MPEG decoding is not possible.

If 1k is not enough, the Recorder's MAS3587 has a full 4kWords:

"The standard functions of the MAS 3587F can be extended or substituted by
downloading up to 4 kWords (1 Word = 20 bits) of program code and
additionally up to 4 kWords of coefficients into the internal RAM."